Data encryption processing method, device and system based on block chain

The invention relates to the technical field of information security, and provides a data encryption processing method, device and system based on a block chain, equipment and a storage medium. The method comprises the following steps: acquiring ciphertext data obtained by homomorphic encryption of confidential data; synchronizing the ciphertext data to a computing node device through the block chain, and sending a first transaction request to the block chain, so that the computing node device calls a chain code to perform operation on the ciphertext data; receiving a second transaction request fed back by the computing node device when the noise of the ciphertext data reaches a preset bottleneck value in the operation process; in response to the second transaction request, calling the chain code to perform re-encryption operation on the ciphertext data to obtain re-encrypted ciphertext data; and sending the re-encrypted ciphertext data to the computing node device through the block chain, so that the computi